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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/07/30 19:16:10 UTC
[GitHub] [arrow] pi-guy-in-the-sky opened a new issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
pi-guy-in-the-sky opened a new issue #10844:
URL: https://github.com/apache/arrow/issues/10844
I'm currently working on a tool in C++ which needs to fetch data from an S3 bucket. Calling `arrow::fs::S3FileSystem::OpenInputStream` allows me to get an `arrow::io::InputStream` that can read from the file. However, an external library in my application needs to read from the file through an `std::istream`. Is there any way I can get an `std::istream` from an `arrow::io::InputStream`?
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[GitHub] [arrow] westonpace commented on issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
westonpace commented on issue #10844:
URL: https://github.com/apache/arrow/issues/10844#issuecomment-893109974
No. It also might be a bit tricky to build one effectively using just STL. You could wrap the buffers in `stringstream` but that does a copy. I think Boost has some [utilities](https://www.boost.org/doc/libs/1_73_0/libs/iostreams/doc/guide/generic_streams.html) which might help. @pitrou Any ideas?
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[GitHub] [arrow] pitrou commented on issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
pitrou commented on issue #10844:
URL: https://github.com/apache/arrow/issues/10844#issuecomment-893232509
We may also want to expose such a facility in Arrow, provided someone contributes it.
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[GitHub] [arrow] westonpace commented on issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
westonpace commented on issue #10844:
URL: https://github.com/apache/arrow/issues/10844#issuecomment-893109974
No. It also might be a bit tricky to build one effectively using just STL. You could wrap the buffers in `stringstream` but that does a copy. I think Boost has some [utilities](https://www.boost.org/doc/libs/1_73_0/libs/iostreams/doc/guide/generic_streams.html) which might help. @pitrou Any ideas?
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[GitHub] [arrow] pitrou commented on issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
pitrou commented on issue #10844:
URL: https://github.com/apache/arrow/issues/10844#issuecomment-893231807
No further idea. It seems the Boost page you linked to might help.
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[GitHub] [arrow] westonpace closed issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
westonpace closed issue #10844:
URL: https://github.com/apache/arrow/issues/10844
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[GitHub] [arrow] pitrou commented on issue #10844: Getting an `std::istream` from an `arrow::io::InputStream`
Posted by GitBox <gi...@apache.org>.
pitrou commented on issue #10844:
URL: https://github.com/apache/arrow/issues/10844#issuecomment-893231807
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